1/*- 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Christos Zoulas of Cornell University. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $NetBSD: sig.c,v 1.15 2009/02/19 15:20:22 christos Exp $ 33 */ 34 35#if !defined(lint) && !defined(SCCSID) 36static char sccsid[] = "@(#)sig.c 8.1 (Berkeley) 6/4/93"; 37#endif /* not lint && not SCCSID */ 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD$"); 40 41/* 42 * sig.c: Signal handling stuff. 43 * our policy is to trap all signals, set a good state 44 * and pass the ball to our caller. 45 */ 46#include "sys.h" 47#include "el.h" 48#include <stdlib.h> 49 50private EditLine *sel = NULL; 51 52private const int sighdl[] = { 53#define _DO(a) (a), 54 ALLSIGS 55#undef _DO 56 - 1 57}; 58 59private void sig_handler(int); 60 61/* sig_handler(): 62 * This is the handler called for all signals 63 * XXX: we cannot pass any data so we just store the old editline 64 * state in a private variable 65 */ 66private void 67sig_handler(int signo) 68{ 69 int i; 70 sigset_t nset, oset; 71 72 (void) sigemptyset(&nset); 73 (void) sigaddset(&nset, signo); 74 (void) sigprocmask(SIG_BLOCK, &nset, &oset); 75 76 sel->el_signal->sig_no = signo; 77 78 switch (signo) { 79 case SIGCONT: 80 tty_rawmode(sel); 81 if (ed_redisplay(sel, 0) == CC_REFRESH) 82 re_refresh(sel); 83 term__flush(sel); 84 break; 85 86 case SIGWINCH: 87 el_resize(sel); 88 break; 89 90 default: 91 tty_cookedmode(sel); 92 break; 93 } 94 95 for (i = 0; sighdl[i] != -1; i++) 96 if (signo == sighdl[i]) 97 break; 98 99 (void) sigaction(signo, &sel->el_signal->sig_action[i], NULL); 100 sel->el_signal->sig_action[i].sa_handler = SIG_ERR; 101 sel->el_signal->sig_action[i].sa_flags = 0; 102 sigemptyset(&sel->el_signal->sig_action[i].sa_mask); 103 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 104 (void) kill(0, signo); 105} 106 107 108/* sig_init(): 109 * Initialize all signal stuff 110 */ 111protected int 112sig_init(EditLine *el) 113{ 114 size_t i; 115 sigset_t *nset, oset; 116 117 el->el_signal = el_malloc(sizeof(*el->el_signal)); 118 if (el->el_signal == NULL) 119 return -1; 120 121 nset = &el->el_signal->sig_set; 122 (void) sigemptyset(nset); 123#define _DO(a) (void) sigaddset(nset, a); 124 ALLSIGS 125#undef _DO 126 (void) sigprocmask(SIG_BLOCK, nset, &oset); 127 128 for (i = 0; sighdl[i] != -1; i++) { 129 el->el_signal->sig_action[i].sa_handler = SIG_ERR; 130 el->el_signal->sig_action[i].sa_flags = 0; 131 sigemptyset(&el->el_signal->sig_action[i].sa_mask); 132 } 133 134 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 135 136 return 0; 137} 138 139 140/* sig_end(): 141 * Clear all signal stuff 142 */ 143protected void 144sig_end(EditLine *el) 145{ 146 147 el_free((ptr_t) el->el_signal); 148 el->el_signal = NULL; 149} 150 151 152/* sig_set(): 153 * set all the signal handlers 154 */ 155protected void 156sig_set(EditLine *el) 157{ 158 size_t i; 159 sigset_t oset; 160 struct sigaction osa, nsa; 161 162 nsa.sa_handler = sig_handler; 163 nsa.sa_flags = 0; 164 sigemptyset(&nsa.sa_mask); 165 166 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 167 168 for (i = 0; sighdl[i] != -1; i++) { 169 /* This could happen if we get interrupted */ 170 if (sigaction(sighdl[i], &nsa, &osa) != -1 && 171 osa.sa_handler != sig_handler) 172 el->el_signal->sig_action[i] = osa; 173 } 174 sel = el; 175 (void) sigprocmask(SIG_SETMASK, &oset, NULL); 176} 177 178 179/* sig_clr(): 180 * clear all the signal handlers 181 */ 182protected void 183sig_clr(EditLine *el) 184{ 185 size_t i; 186 sigset_t oset; 187 188 (void) sigprocmask(SIG_BLOCK, &el->el_signal->sig_set, &oset); 189 190 for (i = 0; sighdl[i] != -1; i++) 191 if (el->el_signal->sig_action[i].sa_handler != SIG_ERR) 192 (void)sigaction(sighdl[i], 193 &el->el_signal->sig_action[i], NULL); 194 195 sel = NULL; /* we are going to die if the handler is 196 * called */ 197 (void)sigprocmask(SIG_SETMASK, &oset, NULL); 198} 199